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The invisible tracking dots in almost every printer.
https://www.bbc.com/future/article/20170607-why-printers-add-secret-tracking-dots
Similarly, there's patterns of circles on banknotes that prevent you scanning them or loading them into Photoshop.
I actually tried this and our office scanner refused to scan it, threw an error each time. Worked fine with a regular document.
Yeah, it's mostly this.
https://en.wikipedia.org/wiki/EURion_constellation
Although I think there are a couple of other methods in play.
Person named Reality Leigh Winner…somehow that sounds exactly like the name of someone who would leak documents
I mean... She's the reason we know the Russians wanted Trump to win and took actions to compromise our physical election infrastructure. She leaked that while the Trump administration was actively trying to bury it.
yeah there's irony to the name and coinciding events... almost like someone named Trump hoarding national secrets after an attempted coup.